Auto-Skim Skimmers for vinyl and fiberglass applications install easily and perform flawlessly, even in the most difficult environments. They are molded of rugged non-corrosive ABS and have snap-in weir that adjusts automatically to water level fluctuations up to 4.5 inches. Features include an automatic bypass for low water conditions, adjustable cover collar, a rigid, 163 cubic inch basket, integral Flo-Control slide plate, and a choice of threads for piping versatility.